Patriot, 25 Pack, 2", T-Post Extender Insulator, Protects Existing Fence By Extending Electric Fence Wire 2" Off The T-Post, Special Wrap Design Secures Insulator To Post, For Use With Poliwire, Steel/Aluminum Wire, Made From Quality Plastic & Porcelain Materials That Are UV Stable & Designed For Long Life, 5 Year Warranty.